function rem() {
  var htmlEle = document.documentElement;
  var winWidth = htmlEle.clientWidth || document.body.clientWidth;
  var width = winWidth <= 1024 ? 1024 : winWidth;
  htmlEle.style.fontSize = Math.ceil(100 * (width / 1920)) + 'px';
  htmlEle.style.height = htmlEle.clientHeight + 'px';
  htmlEle.style.minWidth = 1024 + 'px';
};
rem();
window.onresize = function() {
  rem();
}
